savage



UNITED; sTATEs PATENT s. T. SAVAGE, or ALBANY; NEW YORK.

sTo-VE Ann EURNE; "1'

Specification of LetterSL'IPaltent No.1 15;984, dated etber i w Toalti/whom t may concern. f n

Be it known `that 15S. T. TSAvAGE, of Al-4 bany, inthe State of'NevvYork, have Einvented certain new and useful-Improvements in Stoves andFurnaces forBurni-ngL the Gases -Evolvedf from "the Coals UnderCombustion, of `which the following is" a full, clear, and exactdescription, "reference being had toy the accompanying drawings,`

making. part ofthis specificationrin' Which-L' Figurel, is an elevationofa stove on `my improved plan fo'r heating apartmentssfFig. 2, averticalsectionwthereof,fand Figs. =3, and 4:, horizontal `sectionstaken at the lines Afa, and B, 5, o`f Fig. 2. i Fig. 5, is a Side'elevation of a cookingfist-ove on `my im-f viniammationof \all thecombustible fgases evolved Vfrom the coal,l increasing the production of'inflammable gases from the coal by the distilling effect `of ythe heatgener ated above the coal by the-iniammation"of the combustible, gasesabove thecoail thereby at the* same time checking the draft of airthrough the charge of coal, and increasing the heating effect due totheconsumpr tion of a given quantity of coal-by-theflame produced by theinflammation of the' com# bustiblegases in the parts of lthe stoves orfurnace remote from the coals onthegrate.

The `same letters indicate like parts in Figs. l, 2, 3, and 4@ In the"`said figures ai represents the `fire chamber yof a cylinder stove withthe usual grate b, ash pan-lc, below, feeding door (Z for fuel, anddraft door e, below thegrate. The topplate f, Iof the lire chamber isslightly concaved upvvard with a `large central hole g, for the passageof the products of combustion to? a chamber L, above, and the solepurpose of the concave form of the under surfacelofthisplate is thebetter to direct the products of combustion to the central hole. In thechamber t, and just over the central hole g, there is a circular platez', of greater diameter than the hole g, but of less diameter than thechamber.` gThis pla-tefis ofcorresponding form With theplateandperforated With numerous small^ldles,*and' the s ace betweenthisplate'land the platelfyan between lthe edgesof lthis perforated'plate Eand the lcircumference of the chamber `h, is to bersufficientfornthe passage^`off`th`e products of chamber j formed by-'twohorizontalparal;` lel' plates` 1c,*andf l, the Y surroundingl cyllindermg and asmalhconcentric" cylinder m* the" centers 'of th'e said platesbeing cut out to` correspondfvvith the'V inner `circumference-of thetvvo plates`c,Z.` Air isadmitted tothe said chamber j,"either' throughperforatibns1 0, in the `surrou'ndinfg cylinder m, *or Vthrough `fs`idepipes 20, 29, tvhich extend from the said ChamberdOWntO, and through thebottom plate 1,'of theistove, .Either or "bothv of these modes ofsupplyingv airto" the chamber j, may be' adopted',` or the "air may 1 besupplied 'in any other 'equivalent' manner.`

*The small `cylinder ny is 'piercedf With numeroussmall 'holesl for the`passag'e'of air from t'hechamber j, to the inside of this cylinder,Whiehpylinderis surmountedf'by a conical=^funnel r,"to contract theupperend of the passage throughthesaidsmall Vcylin der. l And above the'contracted upper en d of the funnelir, there is l ano'therfjchamber s,covered `.by a suitable dome t`,"andthis chamber cornmuni'eatesvviththe. usual exit pipe `orl chimney Coal, either anthracite or 'bituminousis "charged: onthe l grate n and'` y ,after ithas Abeen kindledin theusualianner, the "supply of airy t9 the grater may be partially checkedAby *closing 'the draft door e, but Whethersupplied `with" a partial orfull draft below thegratfe combustible gases" `will be evolvedyfromthecoal' and fill llthe upper part of the fire chamber andin stoves ofthe usual construction 'such'combustible plied to 1the air chamber .j j,Lbecomes heated inl the-i said chamber passes throughthe small apertures"in: the "small `cylinder n, descends into f the; chamber 7L, thencethrough the"apertures"in the plate',"to' the n upper part ofthe'firelchamben and'there mingling with the heated combustibled gasesevolved from the coal inlames them*V producing an intense heatin theupper part of the fire chamber. This increased heat in the fire chamberabove the charge of coal 4causes the evolut-ion of combustible gasesfrom the coal in'greater quantity Ithan can be inflamed in the firechamber, and in consequence it passes up through the central hole in thetop plate of the fire chamber, around the edge of the perforated plate,and thence into the small cylinder n, where it meets and mingles withand is inflamed by atmospheric air in a highly heated state which airpasses into this small'cylinder from the air chamber where it is highlyheated by the combustion of the gases. The products of the combustion ofthe coaland the inflammable gases finally pass off at the exit pipe.

In Figs. 5, 6, 7, 8 and .9, of the accompanying drawings whichrepresent/the application of my said invention to a cooking stove thesame letters indicate like parts. In the said figures a, represents thefire chamber with a'grate b, ash pit c, and oven below and back of thefire chamber. At the upper part of the back plate cZ, of the firechamber, called the fire back there is a long narrow aperture e,surrounded by an air chamber j, which receives air from the room throughan aperture g, in each side i plate of the stove. The inner plates L, of

pipe c, or with the flues Z, passing aroundA the oven 1n any suitablemanner and thence the air chamber are pierced with numerous small holesto supply air to the vaperture or throat e. And within the fire chamberand in front of the aperture or throat e, there is a perforated platez", which is wider than the said aperture. This plate is concavo convexas represented in the drawings, Fig. 6, with its concave surface towardthe aperture or throat, and the edges of this plate are sufficientlydistant from the fire back to permit the gaseous products of combustionto pass around the edges to and through thev aperture or throat e', to achamber j', com,- municating. either directly with the exit to the exitpipe. The front plates of the air chamber, that is to say, that part ofthe lire back which forms the. front plate of the air chamber is piercedwith numerous small holes as at mm, for the admission of air from theair chamber to the space n, between this part of the fire back andperforated plate z", and of course communicating with the fire chambereither through the apertures of the plate z", or around its edges. As inthe heating stove a coal fire being made on the grate, the combustiblegases evolved from the coal will be inflamed in the lire chamber by theheated atmospheric air supplied from the air chamber through thenumerous small holes. This combustion j', and in thus passing along willbe thoroughly mingled with highly heated atmosjpheric air and therebyinflamed producing `a diffused flame which will impart much 1more heatto the stove than could be produced by the combustion of the coal in thegrate alone.

I have thus described the mode of applying my said invention to a stovefor heating apartments, and to a cooking stove and from these twoexamples any one skilled in the art ofconstructing stoves, furnaces andheaters, will be enabled to apply my said invention to any other varietyof stoves, heaters or furnaces for heating or cooking purposes. And fromthe foregoing it will be seen that the mode of application of my saidinvention in the two examples given differ only in the form of theparts.

I am aware that many stoves and furnaces have been made with the view toeconomiZe fuel by the admission of atmospheric air above or beyond thecoal to inlame the combustible gases evolved from the coal undercombustion; but I am not aware that any such plans have been made on theprinciple of my invention. I do not wish however to be understood asmaking claim broadly to the use of an air chamber to supply air to thecombustible gases above or beyond the coal or other fuel. Nor do I 'wishto be understood as making claim to the combination of a throat ornarrow aperture in the flue space supplied with air for the combustionof the inflammable gases.

hat I do claim as my invention and desire to secure by Letters Patentis* The use of the throat, aperture or passage surrounded by an airchamber and pierced with numerous small holes through which atmosphericair passes in numerous small jets to the said throat substantially asdescribed when the said throat is located between the fire chamber, anda flue chamber leading to the exit pipe or chimney and combined with aperforated plate interposed between the said throat and the fire,substantially as and ,for the purpose specilied.

S. T. SAVAGE. lVitnesses:

WM. I-I. BISHOP, ANDREW DE LACY.

